{"id":1156,"date":"2025-03-16T16:03:52","date_gmt":"2025-03-16T08:03:52","guid":{"rendered":"https:\/\/bk.kingc.cc\/?p=1156"},"modified":"2025-03-16T16:03:52","modified_gmt":"2025-03-16T08:03:52","slug":"tcp-ip%e5%8d%8f%e8%ae%ae%e4%b8%ad%e4%b8%89%e6%ac%a1%e6%8f%a1%e6%89%8b%ef%bc%88three-way-handshake%ef%bc%89%e4%b8%8e%e5%9b%9b%e6%ac%a1%e6%8c%a5%e6%89%8b%ef%bc%88four-way-wave%ef%bc%89","status":"publish","type":"post","link":"https:\/\/bk.kingc.cc\/index.php\/2025\/03\/16\/tcp-ip%e5%8d%8f%e8%ae%ae%e4%b8%ad%e4%b8%89%e6%ac%a1%e6%8f%a1%e6%89%8b%ef%bc%88three-way-handshake%ef%bc%89%e4%b8%8e%e5%9b%9b%e6%ac%a1%e6%8c%a5%e6%89%8b%ef%bc%88four-way-wave%ef%bc%89\/","title":{"rendered":"TCP\/IP\u534f\u8bae\u4e2d\u4e09\u6b21\u63e1\u624b\uff08Three-way Handshake\uff09\u4e0e\u56db\u6b21\u6325\u624b\uff08Four-way Wave\uff09"},"content":{"rendered":"\n<p>@[TOC](TCP\/IP\u534f\u8bae\u4e2d\u4e09\u6b21\u63e1\u624b\uff08Three-way Handshake\uff09\u4e0e\u56db\u6b21\u6325\u624b\uff08Four-way Wave\uff09)<br>\u4ee5\u4e0b\u662f\u5173\u4e8eTCP\/IP\u534f\u8bae\u4e2d\u4e09\u6b21\u63e1\u624b\uff08Three-way Handshake\uff09\u4e0e\u56db\u6b21\u6325\u624b\uff08Four-way Wave\uff09\u7684\u8be6\u7ec6\u6574\u7406\uff1a<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e00\u3001TCP\u4e09\u6b21\u63e1\u624b\uff08Three-way Handshake\uff09<\/h3>\n\n\n\n<p><strong>\u76ee\u7684<\/strong>\uff1a\u5efa\u7acb\u53ef\u9760\u7684TCP\u8fde\u63a5\uff0c\u786e\u4fdd\u53cc\u65b9\u540c\u6b65\u5e8f\u5217\u53f7\u5e76\u786e\u8ba4\u901a\u4fe1\u80fd\u529b\u3002<br><strong>\u8fc7\u7a0b<\/strong>\uff08\u52063\u6b65\uff09\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7b2c\u4e00\u6b21\u63e1\u624b\uff08SYN\u8bf7\u6c42\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u53d1\u9001TCP\u62a5\u6587\uff0c\u8bbe\u7f6e\u6807\u5fd7\u4f4d<code>SYN=1<\/code>\uff0c\u968f\u673a\u751f\u6210\u521d\u59cb\u5e8f\u5217\u53f7<code>Seq=X<\/code>\uff0c\u8868\u793a\u8bf7\u6c42\u8fde\u63a5\u3002<\/li>\n\n\n\n<li>\u5ba2\u6237\u7aef\u8fdb\u5165<code>SYN_SENT<\/code>\u72b6\u6001\uff0c\u7b49\u5f85\u670d\u52a1\u5668\u54cd\u5e94\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e8c\u6b21\u63e1\u624b\uff08SYN+ACK\u54cd\u5e94\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u6536\u5230\u8bf7\u6c42\u540e\uff0c\u53d1\u9001TCP\u62a5\u6587\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d<code>SYN=1, ACK=1<\/code>\uff0c\u786e\u8ba4\u53f7<code>Ack=X+1<\/code>\uff0c\u81ea\u8eab\u751f\u6210\u521d\u59cb\u5e8f\u5217\u53f7<code>Seq=Y<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u8fdb\u5165<code>SYN_RCVD<\/code>\u72b6\u6001\uff0c\u8868\u793a\u5df2\u51c6\u5907\u597d\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e09\u6b21\u63e1\u624b\uff08ACK\u786e\u8ba4\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684\u54cd\u5e94\u540e\uff0c\u53d1\u9001TCP\u62a5\u6587\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d<code>ACK=1<\/code>\uff0c\u786e\u8ba4\u53f7<code>Ack=Y+1<\/code>\uff0c\u5e8f\u5217\u53f7<code>Seq=X+1<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u53cc\u65b9\u8fdb\u5165<code>ESTABLISHED<\/code>\u72b6\u6001\uff0c\u8fde\u63a5\u6b63\u5f0f\u5efa\u7acb\uff0c\u5f00\u59cb\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u5173\u952e\u70b9<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u901a\u8fc7\u5e8f\u5217\u53f7\u4e0e\u786e\u8ba4\u53f7\u673a\u5236\u786e\u4fdd\u53cc\u65b9\u540c\u6b65\uff0c\u9632\u6b62\u65e7\u8fde\u63a5\u6570\u636e\u5e72\u6270\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u6b21\u63e1\u624b\u5408\u5e76<code>SYN<\/code>\u4e0e<code>ACK<\/code>\uff0c\u63d0\u9ad8\u6548\u7387\uff08\u670d\u52a1\u5668\u786e\u8ba4\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u80fd\u529b\u5e76\u540c\u6b65\u81ea\u8eab\u5e8f\u5217\u53f7\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e8c\u3001TCP\u56db\u6b21\u6325\u624b\uff08Four-way Wave\uff09<\/h3>\n\n\n\n<p><strong>\u76ee\u7684<\/strong>\uff1a\u4f18\u96c5\u5173\u95edTCP\u8fde\u63a5\uff0c\u786e\u4fdd\u53cc\u65b9\u6570\u636e\u5b8c\u5168\u4f20\u8f93\u5e76\u91ca\u653e\u8d44\u6e90\u3002<br><strong>\u8fc7\u7a0b<\/strong>\uff08\u52064\u6b65\uff09\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7b2c\u4e00\u6b21\u6325\u624b\uff08FIN\u8bf7\u6c42\u5173\u95ed\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u53d1\u9001TCP\u62a5\u6587\uff0c\u8bbe\u7f6e\u6807\u5fd7\u4f4d<code>FIN=1<\/code>\uff0c\u5e8f\u5217\u53f7<code>Seq=U<\/code>\uff0c\u8868\u793a\u505c\u6b62\u53d1\u9001\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u5ba2\u6237\u7aef\u8fdb\u5165<code>FIN_WAIT_1<\/code>\u72b6\u6001\uff0c\u7b49\u5f85\u670d\u52a1\u5668\u786e\u8ba4\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e8c\u6b21\u6325\u624b\uff08ACK\u786e\u8ba4\u5173\u95ed\u8bf7\u6c42\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u6536\u5230<code>FIN<\/code>\u540e\uff0c\u53d1\u9001TCP\u62a5\u6587\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d<code>ACK=1<\/code>\uff0c\u786e\u8ba4\u53f7<code>Ack=U+1<\/code>\uff0c\u5e8f\u5217\u53f7<code>Seq=V<\/code>\uff08\u5f53\u524d\u53d1\u9001\u6570\u636e\u7684\u5e8f\u5217\u53f7\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u8fdb\u5165<code>CLOSE_WAIT<\/code>\u72b6\u6001\uff0c\u901a\u77e5\u5e94\u7528\u5c42\u5904\u7406\u5173\u95ed\u8bf7\u6c42\uff0c\u4f46\u4ecd\u53ef\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u5269\u4f59\u6570\u636e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e09\u6b21\u6325\u624b\uff08FIN\u8bf7\u6c42\u53cd\u5411\u5173\u95ed\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u53d1\u9001\u5b8c\u5269\u4f59\u6570\u636e\u540e\uff0c\u53d1\u9001TCP\u62a5\u6587\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d<code>FIN=1, ACK=1<\/code>\uff0c\u786e\u8ba4\u53f7<code>Ack=U+1<\/code>\uff0c\u5e8f\u5217\u53f7<code>Seq=W<\/code>\uff08\u53ef\u80fd\u4e3a<code>V+1<\/code>\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u8fdb\u5165<code>LAST_ACK<\/code>\u72b6\u6001\uff0c\u7b49\u5f85\u5ba2\u6237\u7aef\u6700\u7ec8\u786e\u8ba4\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u56db\u6b21\u6325\u624b\uff08ACK\u786e\u8ba4\u53cd\u5411\u5173\u95ed\uff09<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684<code>FIN<\/code>\u540e\uff0c\u53d1\u9001TCP\u62a5\u6587\uff1a\n<ul class=\"wp-block-list\">\n<li>\u6807\u5fd7\u4f4d<code>ACK=1<\/code>\uff0c\u786e\u8ba4\u53f7<code>Ack=W+1<\/code>\uff0c\u5e8f\u5217\u53f7<code>Seq=U+1<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5ba2\u6237\u7aef\u8fdb\u5165<code>TIME_WAIT<\/code>\u72b6\u6001\uff08\u6301\u7eed2MSL\u65f6\u95f4\uff09\uff0c\u786e\u8ba4\u670d\u52a1\u5668\u6536\u5230\u540e\u6b63\u5f0f\u5173\u95ed\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u5173\u952e\u70b9<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56db\u6b21\u6325\u624b\u800c\u975e\u4e09\u6b21<\/strong>\uff1a\u56e0TCP\u662f\u5168\u53cc\u5de5\u6a21\u5f0f\uff0c\u53cc\u65b9\u9700\u72ec\u7acb\u5173\u95ed\u6570\u636e\u6d41\u3002<\/li>\n\n\n\n<li><strong>2MSL\uff08Maximum Segment Lifetime\uff09\u7b49\u5f85<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u786e\u4fdd\u6700\u540e\u4e00\u4e2a<code>ACK<\/code>\u53ef\u9760\u5230\u8fbe\u670d\u52a1\u5668\uff0c\u9632\u6b62\u8fde\u63a5\u5f02\u5e38\u4e2d\u65ad\u3002<\/li>\n\n\n\n<li>\u5141\u8bb8\u7f51\u7edc\u4e2d\u672a\u9001\u8fbe\u7684\u6570\u636e\u5305\u81ea\u7136\u6d88\u4ea1\uff0c\u907f\u514d\u65b0\u65e7\u8fde\u63a5\u6df7\u6dc6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e09\u3001\u5e38\u89c1\u95ee\u9898\u89e3\u7b54<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4e3a\u4ec0\u4e48\u5efa\u7acb\u8fde\u63a5\u662f\u4e09\u6b21\u63e1\u624b\uff0c\u800c\u5173\u95ed\u662f\u56db\u6b21\u6325\u624b\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u4e09\u6b21\u63e1\u624b<\/strong>\uff1a\u670d\u52a1\u5668\u6536\u5230\u5ba2\u6237\u7aef\u7684<code>SYN<\/code>\u8bf7\u6c42\u540e\uff0c\u53ef\u540c\u65f6\u53d1\u9001<code>SYN<\/code>\uff08\u540c\u6b65\u5e8f\u5217\u53f7\uff09\u548c<code>ACK<\/code>\uff08\u786e\u8ba4\uff09\uff0c\u56e0\u6b64\u5408\u5e76\u4e3a\u4e00\u6b21\u54cd\u5e94\u3002<\/li>\n\n\n\n<li><strong>\u56db\u6b21\u6325\u624b<\/strong>\uff1a\u670d\u52a1\u5668\u6536\u5230<code>FIN<\/code>\u540e\u9700\u5148\u786e\u8ba4\uff08<code>ACK<\/code>\uff09\uff0c\u4f46\u53ef\u80fd\u4ecd\u6709\u6570\u636e\u5f85\u53d1\u9001\uff0c\u9700\u5ef6\u8fdf\u53d1\u9001<code>FIN<\/code>\uff0c\u5bfc\u81f4\u5206\u4e24\u6b65\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>TIME_WAIT\u72b6\u6001\u7684\u4f5c\u7528\uff1f<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u9632\u6b62\u5ef6\u8fdf\u7684\u91cd\u590d<code>FIN<\/code>\u6216<code>ACK<\/code>\u5e72\u6270\u65b0\u8fde\u63a5\uff08\u82e5\u7acb\u5373\u5173\u95ed\uff0c\u53ef\u80fd\u8bef\u8ba4\u4e3a\u65b0\u8fde\u63a5\u6570\u636e\u662f\u65e7\u6570\u636e\uff09\u3002<\/li>\n\n\n\n<li>\u786e\u4fdd\u7f51\u7edc\u4e2d\u7684\u65e7\u6570\u636e\u5305\u5f7b\u5e95\u6d88\u5931\uff082MSL\u901a\u5e38\u662f\u6570\u636e\u5305\u7684\u751f\u5b58\u5468\u671f\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<p>\u4e09\u6b21\u63e1\u624b\u901a\u8fc7\u201c\u8bf7\u6c42-\u54cd\u5e94-\u786e\u8ba4\u201d\u673a\u5236\u5efa\u7acb\u53ef\u9760\u8fde\u63a5\uff0c\u800c\u56db\u6b21\u6325\u624b\u901a\u8fc7\u53cc\u5411\u72ec\u7acb\u5173\u95ed\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u3002\u7406\u89e3\u8fd9\u4e9b\u673a\u5236\u662f\u7f51\u7edc\u7f16\u7a0b\u548c\u6545\u969c\u6392\u67e5\u7684\u57fa\u7840\uff0c\u5c24\u5176\u5728\u5904\u7406\u8fde\u63a5\u5ef6\u8fdf\u3001\u4e22\u5305\u7b49\u95ee\u9898\u65f6\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator 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